Orangeboard

I'm trying to figure out what would be a good subject for my next instructable. I am working on an aquaponics setup, but there are already instructables on that. I could do one on metalwork but there's plenty already on that and I've invested more than most would to start off on furnaces etc. I do have my own methods that I could share. I am looking to build a coal forge. Maybe documenting that would be a good idea (I currently use propane). I'm also thinking about an instructable on using small or oddly shaped spaces to their potential.